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News Release
August 8, 2016
Industry’s first＊１ portable amateur radio, supporting on both APRS and D-STAR®
New release of 144/430 MHz dual bander TH-D74
JVCKENWOOD will release a new high-end 144/430 MHz dual band portable amateur radio TH-D74
from the KENWOOD brand at the end of August in Japan.
Product name
Model number
MSRP (tax excluded)
144/430 MHz dual bander
TH-D74
72,800 yen
Release
date
End of
August
● Background of the product planning and overview
In the amateur radio set market, there is a high demand for portable radio sets that can be easily carried
and used in any location. At KENWOOD, we have been introducing portable products compatible with
the APRS, the Automatic Packet Reporting System, which realizes real-time two-way data
transmission by using packet communications, and they were favorably received due to their
superioroperability. In order to enhance it’s versatility, JVCKENWOOD has developed a Industry’s first*1
144/430 MHz dual bander TH-D74 that supports the widely used D-STAR®, Digital Smart Technologies
for Amateur Radio, a digital voice and data protocol, too promoted by the Japan Amateur Radio League
(JARL).
This high-end model not only supports both APRS and D-STAR® but is also equipped with the radio
technologies JVCKENWOOD has developed over the years, making it possible to operate in wide range
of radio applications with a wideband reception function (HF bands SSB and CW) and various interfaces.
*1: As to the portable radio set for amateur radio will be sold towards the end of August, an accounting our research as of 8 August 2016.
● Major features of TH-D74
1. APRS for real-time data transmission/reception
1) Built-in GPS provides location, directional information on the color LCD
In addition to real-time information of the local
station obtained with the integrated GPS receiver,
a directional compass that shows real-time
information of the local station as well as distance,
bearing, direction, and moving speed of another
preset station can be displayed on the color
<Relative display compass> <Meteorological information>
screen. This function allows the user to easily
recognize the position and moving direction of
another station in relation to the local station. Furthermore, data (rainfall amount,
temperature, wind direction, wind velocity, atmospheric pressure, and humidity data)
acquired from meteorological observation systems.
2) Station list can be stored up to 100 stations
Up to 100 stations such as mobile stations, base stations, meteorological stations, and
objects can be saved. The type limitation and order of receiving station are adjustable.
In addition, local information can be transmitted as an object.
3) Real-time transmission and reception of APRS message
TH-D74
Messages can be transmitted and received in real time between stations using APRS.
Letters can be typed in using panel keys and pre-stored phrases can quickly be
selected for immediate transmission.
4) QSY function
Voice channels of FM or D-STAR® can be set and quick QSY is possible using frequencies embedded
in beacons from APRS stations and information from received D-STAR® repeater. D-STAR® gateway
is also able to set automatically.
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2. D-STAR®, a digital voice and data protocol for Amateur Radio.
1) Flexible operation of voice mode and data mode
QSO with stations around the world is possible through
flexible operation including conventional simplex
operation, via a single-repeater, and IP-based gateway
repeater. Various types of QSO are supported
in digital format with clear sound quality.
DV mode (Single band)
APRS + DR mode (Dual band)
2) DV fast data mode
DV fast mode make it possible to accelerate the throughput by placing data on a vacant voice frame to
provide fast data transmission.
3) Easy to use DR (D-STAR® repeater) mode
The target station can be called up easily by selecting the access repeater and from the list.
Furthermore, a direct reply function for replying to a IP gateway call by pressing a PTT switch and a
function to check the accessibility condition during kerchunk or passing the gateway. The status can
be easily recognized the intuitive icons on the display. In addition, up to 120 records of TX and RX
history can be stored and be used easily to reconfigure the station informations.
3. Wideband multi-mode reception
Wideband reception can be used with B band. SSB and CW can be received in addition to DV, DV fast
data, FM, NFM, WFM, and AM of between 0.1 and 524 MHz band. The radio is equipped with a fine
mode to zero-in with the minimum step frequency of 20 Hz*2, a bar antenna*3to receive 0.1 to 10 MHz
band, and a simultaneous dual watch function for VxV, UxU, and VxU.
*2: SSB, CW, AM mode only.
*3: Possible to switch to SMA antenna connector.
4. IF Filter to handle adjacent unwanted signals
An IF Filter that reduces adjacent frequency interference when receiving SSB or CW, it provides
excellent contour characteristics.. (Selection range: 2.2 to 3.0 kHz for SSB, 0.3 to 2.0 kHz for CW, and
3.0 to 7.5 kHz for AM)
5. IF Output Mode
An IF signal with a central frequency of 12 kHz and 15 kHz bandwidth can be output through a USB
port, that enables various types of data reception via PC.
6. High-performance DSP contributes excellent audio quality
It is equipped with an audio equalizer to adjust both RX EQ5 band (0.4 to 6.4 kHz) and TX EQ4 band
(0.4 to 3.2 kHz), allowing flexible adjustment ofto the preferablesound quality.
● Other characteristics
1. TFT transflective color LCD for excellent visibility
TFT transflective color LCD is adopted. A backlight is installed for excellent visibility in dark lighting
conditions and it also provides superior visibility even under the sunlight. APRS has a blue
background and D-STAR® has a green background in the popup screen so that it is easier to
distinguish between them.
2. Flat key top for high operability
In addition to a 4-way directional-pad (D-pad), a flat key top is adopted for tactile keypads to ensure
the operability.
3. Weatherproof (IP54/55) for outdoor operation
Equipped with a dustproof and water-jet-proof structure that meets IP54/55
standards assuring to use in outdoors and in bad weather. Heavy-duty
specifications are adopted for operation in sudden rain and other outdoor
environments.
4. High-performance GPS antenna
A high-performance GPS patch antenna is installed on the upper part of the
main body. Functions such as nearest D-STAR® repeater search, GPS logger to
save the position tracking, and automatic time correction are installed as well.
Water jet (example)
5. Bluetooth® and other various interfaces as standard
High-performance
GPS
Bluetooth® (HSP and SPP) as well as microSD/SDHC memory card and is equipped
with a Micro-USB
antenna
terminal for flexible use with a personal computer.
6. Free software for PC
Free computer software such as MCP-D74*4 to manage the settings of memory. and ARFC-D74*3 for
adjusting the radio frequency via PC
*4: MCP-D74 and ARFC-D74 will be available for download (free of charge) at KENWOOD’s website after the product is released.
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● Main specification of TH-D74
General specification
Frequency range
Band-A Transmission:
144 - 146, 430 - 440 MHz
Reception:
136 - 174, 410 - 470 MHz
Reception
Band-A
Reception system
F3E, F2D, F1D,F7W Double super heterodyne
J3E, A3E, A1A Triple super heterodyne
Band-B
Intermediate frequency
Band-B Reception:
0.1 - 76, 76 - 108 MHz (WFM)
(VFO operating range)
108 - 524 MHz
Frequncies below cannot be received.
253 - 255, 262 - 266, 271 - 275,
380 - 382, 412 - 415 MHz
Radio wave format Transmission F3E, F2D, F1D, F7W
Reception F3E, F2D, F1D, F7W, J3E, A3E, A1A
Operating temperature range
-20 °C to +60 °C
When supplied KNB-75L is used -10 °C to +50 °C
Frequency stability
+/- 2.0 ppm
Antenna impedance
50 Ω
Power-supply voltage range
External power source DC 11.0 - 15.9 V (STD: DC 13.8 V)
Battery terminal DC 6.0 - 9.6 V (STD: DC 7.4 V)
External power source 13.8 V / Battery: 7.4 V
Current during transmission
(TYP.)
H
M
L
EL
DC-IN 1.4 A
0.9 A
0.6 A
0.4 A
BATT 2.0 A
1.3 A
0.8 A
0.5 A
Current during reception
(TYP.)
Single 260 mA (at rated power output)
135 mA (SQ close)
48 mA
(average at save)
Dual 310 mA (at rated power output)
185 mA (SQ close)
50 mA
(average at save)
GPS receiver mode 115 mA
*5
Single, Save on, Rate 6:6:48 sec, GPS off
Operation time (reference)
H
M
L
EL
KNB-75L (1,800 mAh) 6 hrs
8 hrs
12 hrs
15 hrs
KNB-7４L (1,100 mAh) 4 hrs
5 hrs
7 hrs
9 hrs
KBP-9 (alkali AAAx6) ----------3.5 hrs
-----About 10% shorter when GPS is on.
Dimension (width x height x depth)Protruding object not included
With KNB-75L 56.0 x 119.8 x 33.9 mm
With KNB-74L 56.0 x 119.8 x 29.3 mm
With KBP-9 56.0 x 119.8 x 36.0 mm
Mass
Body only 202 g
With KNB-75L 345 g (including antenna and clip)
With KNB-74L 315 g (including antenna and clip)
With KBP-9 360 g (including antenna, clip and 6 AAA bateries)
Transmission
Transmission output
Carrier frequency fluctuation
57.15 MHz
450 kHz
58.05 MHz
450 kHz
10.8 kHz
0.18/ 0.22 uV 0.19/ 0.24 uV
0.18/ 0.22 uV 0.20/ 0.25 uV
0.20 uV
0.22 uV
0.22 uV
0.22 uV
0.16 uV
0.50 uV
Excluding above amateur band
AM 10 dB S/N
0.3 - 0.52 MHz
0.52 - 1.8 MHz
1.8 - 54 MHz
54 - 76 MHz
118 - 174 MHz
200 - 250 MHz
382 - 412 MHz
415 - 524 MHz
FM 12dB SINAD
28 - 54 MHz
54 - 76 MHz
118 - 144 MHz
148 - 175 MHz
200 - 222 MHz
225 - 250 MHz
382 - 400 MHz
400 - 412 MHz
415 - 430 MHz
450 - 490 MHz
490 - 524 MHz
SSB 10 dB S/N
1.8 - 54 MHz
54 - 76 MHz
144 - 148 MHz
222 - 225 MHz
430 - 450 MHz
4 uV
1.59 uV
0.63 uV
1.12 uV
0.50 uV
0.63 uV
1.12 uV
1.12 uV
0.36 uV
0.36 uV
0.36 uV
0.36 uV
0.32 uV
0.56 uV
0.36 uV
0.36 uV
0.36 uV
0.36 uV
0.50 uV
0.36 uV
0.36 uV
0.36 uV
0.63 uV
0.40 uV
0.79 uV
0.16 uV
0.20 uV
0.16 uV
FM broadcasting band
External power source 13.8 V / Battery: 7.4 V
H
M
L
5W
2W
0.5 W
Modulation system FM Reactance modulation
DV GMSK reactance modulation
Maximum frequency shift
FM +/-5.0 kHz
NFM +/-2.5 kHz
Transmission spurious
HI / MID -60 dBc or less
L/EL -13 dBｍ or less (144MHｚ）
L/EL -16 dBｍ or less (430MHｚ）
Microphone impedance 2 kΩ
Bluetooth
Version and class
Transmission output
Modulation characteristic
Initial carrier frequency
1st IF
2nd IF
3rd IF J3E, A3E, A1A
Sensitivity
(TYP.)
Amateur band
FM 12dB SINAD
FM/ NFM
144 MHz
FM/ NFM
430 MHz
DV PN9/GMSK 4.8kbps, BER 1%
144 MHz
430 MHz
SSB 10 dB S/N
AM 10 dB S/N
Version 3.0, Class 2
-6 ≺ Pav ≺ 4 dBm
140 ≤ ⊿f 1avg ≤ 175 kHz
-75 ≤ fo ≤ +75 kHz
±25 kHz (1 slot packet)
±40 kHz (3 slot packet)
±40 kHz (5 slot packet)
EL
0.05 W
WFM 30 dB S/N
76 - 95 MHz
1.59 uV
95 - 108 MHz
2.00 uV
Squelch sensitivity
(TYP.)
0.18 uV
0.25 uV
Spurious interference ratio 144MHz
50 dB or more
45 dB or more
50 dB or more
40 dB or more
430MHz
60 dB or more
55 dB or more
IF interference ratio
Selectivity
-6 dB
12 kHz or more
-50 ｄB
30 kHz or less
AF output
7.4 V, 10% distortion rate 400 mW or more/ 8 Ω
GPS
TTFF cold start
Approx. 40 sec
TTFF hot start
Approx. 5 sec
Horizontal positioning accuracy
10 m or less
Reception sensitivity Approx. -141 dBm (capture)
25ºC, open sky
*5： Estimate value when repeatedly operated in proportion of transmission 1: reception 1: and waiting 8 (measurement condition;
transmission 6 sec: reception 6 sec: waiting 48 sec). Measurement method specified by JAIA is applied.
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Supplied items
Comes with an antenna, lithium-ion battery (7.4 V/1800 mAh), AC adapter for charging, belt clip, instruction
manual, and warranty certificate
● Regarding Trademarks
*D-STAR® is a registered trademark of The Japan Amateur Radio League.
*The Bluetooth® word mark and logos are registered trademarks of Bluetooth SIG, Inc. and used by JVCKENWOOD under a license
granted by Bluetooth SIG.
*All other company names, brand names and product names are registered trademarks or trade names of their respective holders.
For further information, please contact:
Media Contact: Public Relations & IR & SR Department, Corporate Communication Division,
JVCKENWOOD Corporation
3-12, Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa 221-0022 Japan
TEL: +81-045-444-5310
Customer Contact: JVCKENWOOD Customer Support Center
TEL: 0120-2727-87 (toll-free call from landline phones)
Contents of this material is of when information was released. Please note that the contents may differ from the latest information.
0570-010-114 (Navi Dial from mobile phones and PHS), 045-450-8950 (some
IP phones)
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